The article presents processes, which took place within the Jewish communities in Portugal in effect of the forced conversion to Christianity in 1497. Special attention was paid to the proper defi nition and classifi cation of certain behaviors characteristic to those processes and which had impact on the development of their self identity. Differences between the notions of marranos, converts and New Christians are discussed as well. Author’s aim was to present the marranos as a complex the phenomenon, which should not be limited to crypto-Judaic practices.Jewish conversions to Catholicism on the Iberian Peninsula and the phenomenon of marranos connected with it extend to early middle ages. Yet neither the voluntary, nor forced Spanis...